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Keying
Specifications
Plastic keying bands provide an easy method for keying an I/O slot
to accept only one type of module. Use of keying bands is strongly
recommended to prevent accidental insertion of the wrong type of
module.
The module is slotted in two places on its rear edge. The position of
the keying bands on the backplane connector must correspond to
these slots to allow insertion of the module. Because the module
uses two slots, both slots have to be keyed. Snap the keying bands
on the upper backplane connectors between these numbers printed on
the backplane (Table 3.A). Keying is different for the 1771-IJ and
the 1771-IK.
Table 3.A
Module Keying
Module
Left Connector
1771 IJ
18 and 20
1771 IK
20 and 22
Insert the module in a single module group (slots
0 and 1). It must not straddle two module
IMPORTANT
groups.
The position of the these keying bands may be changed if subsequent
system design and rewiring makes insertion of a different type of
module necessary.
Complete specifications for the 1771-IJ and -IK modules are
contained in Appendix A.
Installation
Right Connector
6 and 8
4 and 6
32 and 34
6 and 8
4 and 6
32 and 34
Publication 1771 UM006B-EN-P - June 2002
3–5
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